Elliptic curve cryptography.md

EdDSA

由曲線和參數的選擇不同又可以劃分

• Ed25519
• Ed448

Ed25519

基於curve 25519

private key 64 bytes

1. 加密解密很快
2. 安全性高

• 產生 KeyPair

  • supercop.js https://github.com/1p6/supercop.js?files=1(目前用這個才和 AT.Wallet 的結果相同)
  • ed25519.js https://github.com/dazoe/ed25519(和 AT.Wallet 的結果不同)

• Convert Ed25519 signing key pair into Curve25519 key pair suitable for Diffie-Hellman key exchange

  • d2curve.js https://github.com/dchest/ed2curve-js
  • 由於 ed25519 privat key 長度為 64，需轉為 32

curve25519

• shared key between own private key and peer's public key (in other words, this is an ECC Diffie-Hellman function X25519, performing scalar multiplication).
  • curve25519-js https://github.com/wavesplatform/curve25519-js